NEET Biology Genetics : Pleiotropy (Sickle Cell Disease) | Summary and Q&A

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March 26, 2017
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NEET Biology Genetics : Pleiotropy (Sickle Cell Disease)

TL;DR

Pleiotropy is a genetic pattern where one gene controls multiple traits, resulting in varying degrees of influence on different characteristics. Examples, such as sickle cell disease and flower color in peas, demonstrate how a single gene can have widespread effects.

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Questions & Answers

Q: What is pleiotropy?

Pleiotropy is a genetic pattern where one gene controls multiple traits, resulting in varying degrees of influence on different characteristics.

Q: What are some examples of pleiotropy?

Examples of pleiotropy include the same gene controlling wing size, eye color, and bristle position in fruit flies, as well as the gene responsible for both flower and seed color in peas.

Q: How does sickle cell disease exemplify pleiotropy?

Sickle cell disease is an example of pleiotropy because a single defect in the hbb gene can cause multiple impacts on the body, such as damaged organs, high blood pressure, and vision loss.

Q: How is pleiotropy different from polygenic inheritance?

Pleiotropy is the opposite of polygenic inheritance. In pleiotropy, one gene controls multiple traits, while in polygenic inheritance, multiple genes control one trait.

Summary & Key Takeaways

  • Pleiotropy is a genetic pattern where one gene controls multiple traits, with some traits being more influenced than others.

  • Examples of pleiotropy include the same gene controlling wing size, eye color, and bristle position in fruit flies, as well as the gene responsible for both flower and seed color in peas.

  • Sickle cell disease is an example of pleiotropy, where a single defect in the hbb gene can have multiple consequences on the body, including damaged organs, high blood pressure, and vision loss.

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